package org.eoti.util.plugin;

import java.util.ServiceLoader;
import java.util.Iterator;
import java.util.concurrent.ConcurrentHashMap;

/**
 * The MIT License
 * <p/>
 * Copyright (c) 2009 Malachi de AElfweald (malachid@gmail.com)
 * <p/>
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to the following conditions:
 * <p/>
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
 * Software.
 * <p/>
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
public class PluginManager<PLUGIN extends Plugin>
implements Iterable<PLUGIN>
{
	private ServiceLoader<PLUGIN> loader;
	private ConcurrentHashMap<String, PLUGIN> plugins;

	public PluginManager(Class<PLUGIN> pluginClass)
	{
		this.plugins = new ConcurrentHashMap<String,PLUGIN>();
		this.loader = ServiceLoader.load(pluginClass);
		_load();
	}

	public void reload()
	{
		plugins.clear();
		loader.reload();
		_load();
	}

	private void _load()
	{
		for(PLUGIN plugin : loader)
			plugins.put(plugin.getName(), plugin);
	}

	public PLUGIN getPlugin(String name)
	{
		return plugins.get(name);
	}

	public Iterator<PLUGIN> iterator()
	{
		return loader.iterator();
	}
}
